Omron NJ Series User Manual

2 CPU Unit Operation
2-20
NJ-series CPU Unit Software User’s Manual (W501)
The way that the sequence control works depends on the device to control. This section describes the
operation of the function modules and the control period as part of the sequence control system.
*1 With the Sysmac Studio version 1.09 or higher, a Servo Drive and encoder input slave to which an axis is
assigned can also be a part of sequence controls if you assign the device variable to the I/O port of the slave.
*2 The data refresh period in the slave depends on settings in the slave.
*3 The data exchange period with a CJ-series Unit is the task period to which I/O refreshing for the CJ-series Unit
is assigned.
Servo Drive, encoder input, and general-purpose slaves that are not assigned to axes are refreshed in
the process data communications cycle. This means that I/O refreshing takes place in the task period of
the primary periodic task. However, execution of the programs and refreshing of the device variables
take place in the task period of the task to which the programs are assigned. This means the slave val-
ues are not reflected and not controlled by the device variables until the task period of the task to which
the programs are assigned.
If it is necessary to control a slave in the process data communications cycle, assign the program that
controls the slave to the primary periodic task.
For details, refer to 5-3-4 System Input and Output Response Times.
2-4-2 Sequence Control System
Device
Sequence Control System
Operation of the function module Control period
Servo Drive, encoder
input
*1
, and general-pur-
pose slaves
• The PLC Function Module executes the user pro-
gram and refreshes the device variables.
• The EtherCAT Master Function Module exchanges
data with the slaves through the I/O ports for device
variables.
The task period of the task to
which the program is
assigned (i.e., the task period
of the primary periodic task
or a periodic task)
*1
CJ-series Units The PLC Function Module executes the user pro-
gram, refreshes the device variables, and exchanges
data with the CJ-series Units.
The task period of the task to
which the program is
assigned (i.e., the task period
of the primary periodic task
or a periodic task)
*2
Data refresh
period in slave
NJ-series CPU Unit
CJ-series Unit
Instruction
Executed.
PDO communications
PLC Function Module
User program
execution
Device variables
Sequence control period (task
period of the primary periodic task
or the periodic task)
I/O refreshing in the process data
communications cycle (i.e., task period
of the primary periodic task)
EtherCAT
Master
Function
Module
I/O ports
Servo Drive, encoder
input, and general-
purpose slaves that are
not assigned to axes

Omron NJ Series Specifications

General

Brand	Omron
Model	NJ Series
Category	Controller
Language	English